Install everything first, then upgrade to prerelease?

Author: meatballhat

scripts/install-deps-prerelease

@@ -10,7 +10,7 @@ main() {
 
   local pipenv_requires="${top}/.pipenv-requires"
 
-  pipenv run pip install toml
+  pipenv install --dev
   _print_pipfile_packages >"${pipenv_requires}"
   pipenv run pip install -U --pre -r "${pipenv_requires}"
   rm -f "${pipenv_requires}"